replaceState throws 'before the router is initialized' during hydration, which killed the sync $effect on its first tick so the URL never updated on pan/zoom. Gate the write behind a flag flipped after the first post-mount tick() (router started) plus a defensive try/catch. Verified live: zoom now updates ?z=. The prior component test mocked replaceState and masked this. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
sv
Everything you need to build a Svelte project, powered by sv.
Creating a project
If you're seeing this, you've probably already done this step. Congrats!
# create a new project in the current directory
npx sv create
# create a new project in my-app
npx sv create my-app
Developing
Once you've created a project and installed dependencies with npm install (or pnpm install or yarn), start a development server:
npm run dev
# or start the server and open the app in a new browser tab
npm run dev -- --open
Building
To create a production version of your app:
npm run build
You can preview the production build with npm run preview.
To deploy your app, you may need to install an adapter for your target environment.